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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '933530f9e3c691463454c510591beeb5d1cb0d464de5bd5e125de267c05903b0' 
  AND token = 'ibyVPXtDYYUKyTz5tSPABEDvoEh8bE/o8NFR/+q+xTY=' 
  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"
    }
  }
}