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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '467baa7ca9998fe671ce72cfe5de3186eb0d3439f9e2f41f04c5d4cb8795a004' 
  AND token = 'EUVSha+iiCbM+vrg+KmMq1xfe+ITPTKgShltVufH0C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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