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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12b7e170693c296516988b6ce21b3b73e5b5f76ac91f306cce00d72857f91d1c' 
  AND token = 'aCPc+3qqtaHp8DJI3amoSiRicGTQ322hMHQKaPaQuAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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