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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e1aeaac49e5de5c26a65d3025ce4d6176960f160c427b79a1a9a106387b14ee' 
  AND token = 'qfPZAv9t0+MBzRiXIqPabJMvBHI6jr+7AfR6vtOI+bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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