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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e622c53e8409494b1acb2efb9c05220a7481e9c0e6016870ac50eb5ce6f3f7fb' 
  AND token = 'D7VYtRT1pMhc2VDyGMr2z21xQFj3W/V1PNHfCQx87ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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