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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51b284b4723d29d390870ca69e8c6908e64a8796fab0806dbd8aad08d457de26' 
  AND token = 'XcUbPUXjAW2TFpOZ4WEqRJ+3yVKSN/456NFQ88xSoXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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