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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c82ffd7fb0f13d3c044d698ba9b54a6b0287c2da0ab20c6ba073b065dcaa652' 
  AND token = 'W+z7KFtTzJogx4EaBt0+2v8+IYPPpDL6l7WhZfS8h3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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