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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09df7e90233b886f3cbe0203a193a4086e838e4a742cebfeb6482cdd7df761de' 
  AND token = '9ZWwAqRzf9OMwo12GXbxb2741BHuIb0gr6VSCX+rWb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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