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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '314f93d4bfdaffee85e78a02016799942cc980a924779354b1e22b2c79af3b9f' 
  AND token = 'RzdXImfoJIy7c8+oy/s4L0C8dumv3R+DlNs+qy8kNG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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