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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56afbd9f4feeaf93a69b825f901b762615582c0cb3dd9a182a2491aed4c2ae6a' 
  AND token = 'tuWI+YoW6a/A8NGlt92hZbG1+b8dfhiDT/xmSK71E0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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