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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98eec285f1c271d59848b9c72585a4a11136ff9b06d21741eee623c0c2656f23' 
  AND token = '1TikwLiI1XO/hgnsOb6xxkN/jRGJoozsBv8lir01gt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}