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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78f549399f3bd018efa8cf8211897c3fc5a818d84b91601099778a80f9025f87' 
  AND token = 'h/obKlYSeIGHnCef8PVdQHfeR2Z6nVlXf75lEZo3mLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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