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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '687ae9ce1226236efd5e8f6bbce49488847df5967e4c5f1edb02871154839a9a' 
  AND token = 'ILxYc38UEAU7KLt1EarY6R4U9dgRpi4row6wPOPrgCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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