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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2d4f5391757c3c111f8fd7466e04cf5aefe67f6f3d8d80257a43e560b1d09e8' 
  AND token = '6wz+dPpat8IlceBUSfQDBXSHj34Rtf/4JU8clqgbZhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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