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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88136ed086712c75660b85830314f4c1447ed2b31f7e4db144de5e792990edb5' 
  AND token = 'L5i7JdIPjxZRV0obO1peMtYF7OdQDiJqVi3UzQIgCM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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