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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3aeec4636bfd4b70d23e54ad84811a4b8a68afa4ac7f1d41e99c99c55dc583c' 
  AND token = '80KOOXuI+RHdjuQ/CuFDoERUk7ldHcvDuQ2qOXwgQ2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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