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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88f281ef58897315f0ce05e4ac740bbcddbf0025a9dbb7e590cd8ce67f74dc12' 
  AND token = 'b4ug2f05PIU7pOfAAmqzE0FAgHr+NYU6f+AvGERSUY4=' 
  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"
    }
  }
}