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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92b696b74b0bc4b41c8b4add8aac9834cf604f22286f70532fb896835c97f5a7' 
  AND token = '/n8Ay3K5O8EqU9in/OLrEhYNX2xeW42trxjBnBNyFkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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