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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a869e6b25dc7f97e20c53a8723a3e09169bbdeb5811e7a1180038dd15a1500' 
  AND token = 'GZeHe7hHDWVZCr5jLEQ/ZvzMF2456yQdSLf6Bg2Jf/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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