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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c1adc3343d14fd954ccfea98cbe5890c9230983e9b1e0980e7ebdb279f67cd' 
  AND token = '9zUbHFQXxhLZbTL0LuLyAI9vd1l0p4u6j52qEjWiI0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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