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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08ca30594a1588b9091250af9092a78ef88813d365689cd051c47c015c4cdc80' 
  AND token = 'X2eP1HHn7lLuviZ8e+88bEyhMOAbqe7ltz8HsI7uMTU=' 
  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"
    }
  }
}