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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa2131096a2e3dc58c1a687663fec117d0aa0604442f6a0a07feaf8947b39ef3' 
  AND token = '9qtyr9FdT+HeBu/p05i+mXLtZmJ4A7mkZk+YWpOD07k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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