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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d7751531f6c821a72045bca102a51604bb2a3d97876c54c4e4203d881efb6fe' 
  AND token = 'SKNto9Pke89IV3yJTzNKtKIHf0y1kXcGCXmuYgvF6F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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