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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3babaa0bc6dbbf7fd1d806ec353787c58a896434b008f4522ea854d42ab3c21' 
  AND token = 'nQi83PbM2b5qelYFjz3HNZ/5XFUf+RGX2AxTwdxi09A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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