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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86c6144e98c4634bf8afe9fde22416a13856a5bb3d3b3d279ee5ff7eafbc0bf5' 
  AND token = 'a4pLT0tuI7xhGKinjawUryASGlIBJ61c57EKIydUz8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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