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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b9c6b3983a04bd7b3067acd038f47c06ac598b68d572bed4ab1fd282e571708' 
  AND token = 'jndjVMdhFy2GTsBSIRryQuD5H/O7R1/1qS5uqiCkZWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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