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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b0fa6b4973f59c4426d5519847d84583bb44e1c2d9a3da2bad72514e2ca39ef' 
  AND token = 'WKhoyp1M5TP4JXWwu4kFfoAl+Li4GwdSoIwVP9aKueM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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