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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b37d13cacf393541141d6914d7ae34f4853e822406e21e2fdf6445d260d80cf' 
  AND token = 'YjQOVaHiCba7rc8V3d+qsfgVSqIU+7L+vLtrhLWtM2I=' 
  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"
    }
  }
}