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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a66ff8b5f8f0474053d43bec9a587f2e3161dd2d0947ca8405210d78489f82e0' 
  AND token = 'Z5UYCIIu69i//js1+qE/dd6lpo67hEubQA1jwCBS56Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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