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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2231dff27af192ecdbc1b7c7954f071c0cf2845d13797c406dfcad2126dbb7ad' 
  AND token = 'olSGq6ArDRgXONy8Kmd5MnhViE6Nf3TGBK2TzsUpB34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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