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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66ae2896d442eebc14c4e18a6de28f503558db00ef70767c60849e10ad62efba' 
  AND token = 'e1st97/6uM5LVf0GhXr4b8cJWY+8uGo1tKi3Ux15n84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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