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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7658b87643e44ff750dd3870a46e3a73308c3d62b8ccea4d18114b6a3e67c165' 
  AND token = 'TdtIgSIa7l6AFE3y8VRgXaqSDkTf52HVbIpJTkzHFng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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