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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '209056f22b9e7098e00acaf2c0d65e21d77bf1f2dcbc75b18a3c137987953ae5' 
  AND token = 'hrKXIg+h/ZHWoxJ3yK5zdNW7e/a2exXxYtgWdWb3Hc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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