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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a56c76bafc170034837369927532ce738f39775fbe2d065b7aa7dbd2fb8c633' 
  AND token = 'VhaXX8jawGSY4sP2QPzDE9ElaoM07j+mQsA4T0IR5dM=' 
  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"
    }
  }
}