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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ed9c50376ef4429cfc7b4f6e6340328469067fa0a3bfdd81d6bed34707c04be' 
  AND token = 'ki5WuLZ1rJW/sScxmiIv1LoXmCMHUJ4sd0Ce6RdFaYc=' 
  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"
    }
  }
}