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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b51940fc8f76905797ee003a7d2f472465c28601d97986d1316b93d99db43ac5' 
  AND token = 'wwfRzVVXFM4n/xCx1BYXWCkV/NL9Y7ucgbVxsBcOn1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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