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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b25c3a02e345a03e01d60e5c40b5f562381ed4dba74007f9715c96e4ef73660' 
  AND token = '7MdirRoOSljS8KkLrAado41j9zREfamf070AFsGaXKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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