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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7d3838734884ced1f83d23a8dd0b8f0ee791609e80ca1df8a3846f60d50414a' 
  AND token = 'AfibSD94Fwa2xIYXI13P4DVT8anbjP3friAoNZDEs0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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