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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e928d69f60e54cde3812f88181e8691360a4ac71aac5443170784fb821670ac0' 
  AND token = 'lxyl8ksQ8zPHxvlluP2mVlwHwGzt1dN7Kv73s0OiTb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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