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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3df7baa3b5510c16d9b1ae6d41860dc78ebb928a379f088bf3b5620c1734a55d' 
  AND token = 'FIexKVDiaAS/Kj3d+FBGInGIr/Hk08dnE1035VjsZmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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