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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd88d179e0744c1d3792ed6ce0e80ba09904f95a1e82a2daa82ca04d1fbb6be' 
  AND token = 'WXdJXsPOm76NdKSJb0dV7ZPfVG3gVMS96c+v6MXnkaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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