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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f10075cf1df340938c9377e08d31a32049011d8f2d67cff8617cc7fdc0f9841d' 
  AND token = '4Egom9i3A8Qolw9ERoeVKuj8+XfmEGzkICQvqr0khQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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