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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03dbd9ec370d08efa73dc567740f2df064c67672f27bfac1b2687c5ba1b493e1' 
  AND token = 'Cg+A7eJkEz8UOEfaFWP4zY2q6OzzpshW7pcpXX2Tspo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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