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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db717a1a9b31a6047d95a9f8e26edbb268e9a035418ae7edb67116b793f23e35' 
  AND token = 'JKV79nn0tYuexrAjKpv8wy2Zqqk/N3/yx62Cgynu8P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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