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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffae4e2fb8bdc117c0a54c81748a9c127f61cb66673b183a69ab8cd6f79ed4be' 
  AND token = 'pUsbXD7FGrbp6Z7vi3oMMXwipis3VeICvN+srnm4dPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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