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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12df0dd7db58609de558bebb4acadaf8f6b4824e8feffb1561fd74fd510973f5' 
  AND token = 'U+1TgkqB7XsCjKXI83t5ekEsk/sjBX/fV7MHIzz1/tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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